<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search :bgcolor="'#C00000'" :radius="20" @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view  class="left-scroll-view" scroll-y="true"  :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true"  :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 三级分类列表 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 三级分类图片 -->
              <image :src="item3.cat_icon" mode=""></image>
              <!-- 三级分类文本 -->
              <text >{{item3.cat_name}}</text>
            </view>
            
          </view>
          
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        cateList: [],
        active: 0,
        //二级分类列表
        cateLevel2:[],
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      console.log(sysInfo)
      this.wh=sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList(){
        const {data: res}=await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status!=200) return uni.$showMsg()
        this.cateList=res.message
        this.cateLevel2=res.message[0].children
      },
      activeChange(i){
        this.active=i
        //重新为二级分类赋值
        this.cateLevel2=this.cateList[i].children
        this.scrollTop= this.scrollTop === 1 ? 0 : 1
      },
      //跳转到商品页面
      gotoGoodsList(item){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      //搜索
      gotoSearch(){
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    .left-scroll-view{
      width: 200px;
      .left-scroll-view-item{
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        
        &.active{
          background-color: white;
          position: relative;
          
          &::before{
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: red;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
        
      }
    }
    .cate-lv2-title{
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
      
    }
    
    .cate-lv3-list{
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item{
        width: 33.33%;
        display: flex;
        flex-direction: column;
        align-items: center;
        margin-bottom: 10px;
        image{
          width: 60px;
          height: 60px;
        }
        text{
          text-align: center;
          font-size: 12px;
        }
      }
    }
    
  }
  
  
</style>
